Vegetative yield and photosynthetic rate of kenaf (Hibiscus cannabinus L.) in reclaimed lands

초록

As the land reclamation is widely practiced to satisfy increasing demands of land for human activities, how to utilize reclaimed lands has become a concerned theme. Considering environment protection and wildlife habitat conservation, the draining of wetlands has not been allowed in the latest reclamation projects. To exploit and select salt-tolerant plant species with intrinsic potential for adaptation to reclaimed lands and suitability to grow in such lands becomes an urgently required work. In this study, we investigated the responses of four kenaf (Hibiscus cannabinus L.) cultivars to reclaimed lands. During the experimental period in reclaimed lands, there was no significant decrease found in photosynthesis and relative water content among the four cultivars. Although Dowling was found to show relatively high adaptability expressed by the high growth rate, it showed the lowest vegetative yield. Most of the cultivars showed a large decrease in relative water content in root than in leaf, but Fuhong-952 persistently maintained relatively high water content in root, suggesting that the plant growth of Fuhong-952 was affected little by reclaimed lands. In view of the results of photosynthesis, plant growth and vegetative yield, Tainung-2 was finally considered to be the ideal cultivar for cultivation in reclaimed lands.

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